Laguna Pressure-Flo Filter 1400 UVC is an all-in-one filtering system that keeps pond water clear and healthy. The high performance filter provides important water filtration functions that are essential for everyday pond maintenance: mechanical filtration as well as UVC sterilization. Pressure-Flo 1400 is designed to work in tandem with a solids handling pump such as Laguna's Max-Flo circulating pump. With the filter connected to the pump water enters the unit through a water inlet. It then passes through the mechanical filtration stage consisting of foam filters that intercept and trap dirt and debris. Dirt-free water then passes along an integrated UV-C lamp where it is exposed to ultraviolet rays that inhibit the growth of single-celled algae organisms. Water finally returns to the pond thoroughly cleansed. Pressure-Flo features a revolutionary Backwash-Cleaning System that completely cleans the entire surface of the foam filters. This patent-pending system is the only one of its kind. Backwash cleaning can easily and comfortably be done in a few minutes without opening the lid. This feature ensures that the filter performs at optimal levels for many days and prolongs the time between full maintenance sessions. An easy-view cleaning indicator signals when it's time to perform backwash cleaning. The unit can be installed in or above ground. Pressure-Flo 1400 UVC is for ponds up to 1400 U.S. gallons/5000 L and comes complete with an 11-watt UV lamp filter foam and Biospheres biomedia.